Added three sample video hooks. See the (rudimentary) documentation on what

they do and their capabilities.

Originally committed as revision 1265 to svn://svn.ffmpeg.org/ffmpeg/trunk

vhook/null.c

@@ -0,0 +1,73 @@
+/*
+ * Null Video Hook 
+ * Copyright (c) 2002 Philip Gladstone
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <stdio.h>
+
+#include "framehook.h"
+
+typedef struct {
+    int dummy;
+} ContextInfo;
+
+
+int Configure(void **ctxp, int argc, char *argv[])
+{
+    fprintf(stderr, "Called with argc=%d\n", argc);
+
+    *ctxp = av_mallocz(sizeof(ContextInfo));
+    return 0;
+}
+
+void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, INT64 pts)
+{
+    ContextInfo *ci = (ContextInfo *) ctx;
+    char *buf = 0;
+    AVPicture picture1;
+    AVPicture *pict = picture;
+
+    (void) ci;
+
+    if (pix_fmt != PIX_FMT_RGB24) {
+        int size;
+
+        size = avpicture_get_size(PIX_FMT_RGB24, width, height);
+        buf = av_malloc(size);
+
+        avpicture_fill(&picture1, buf, PIX_FMT_RGB24, width, height);
+        if (img_convert(&picture1, PIX_FMT_RGB24, 
+                        picture, pix_fmt, width, height) < 0) {
+            av_free(buf);
+            return;
+        }
+        pict = &picture1;
+    }
+
+    /* Insert filter code here */
+
+    if (pix_fmt != PIX_FMT_RGB24) {
+        if (img_convert(picture, pix_fmt, 
+                        &picture1, PIX_FMT_RGB24, width, height) < 0) {
+        }
+    }
+
+    av_free(buf);
+}
+
+/* To ensure correct typing */
+FrameHookConfigureFn ConfigureFn = Configure;
+FrameHookProcessFn ProcessFn = Process;